Improvement in motors



G. w. WILSON. Motors.

No. 198,480. Patented Dec. 25,1877.

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UNITED STATES PATENT OEEIoE.

GEORGE W. WILSON, OF CHICAGO, ILLINOIS.

IMPROVEMENT lN MOTORS.

Specification forming part of Letters Patent No. 198,480, dated December25, 1877 application filed April 13, 1877.

To all whom it may concern:

Be it known that 1, GEORGE W. WrLsoN, of Chicago, in the county of Cookand State of lllinois, have invented a new and useful I Improvement inSewing Machine Motors,

which is fully set forth in the following specification, reference beinghad to the accompanying drawings, in which- Figural represents a frontelevation of a sewing machine with my improvement attached, theinclosing case being open; and Fig. 2, an elevation of the governor andgearing, with which it is immediately connected, on an enlarged scale.

My invention relates to an improvement in spring-motors forsewing-machines.

Motors of this description are well known, and many attempts have beenmade to apply them successfully to the work of driving sewing-machines.One great obstacle to their success, however, has been the difficulty ofregulating them so as to obtain uniform motion.

Heretofore this has been attempted by using a brake controlled by theattendant; but it is almost impossible by this device to make the motionsteady, and it compels the attendant to keep one hand constantly on thebrake, leaving only one hand free to manage the fabric to be stitched.

The object of my invention is to regulate the operation of the drivingmechanism automatically, so as to secure steady motion of the needle,and at the same time leave both hands of the attendant free.

The invention consists in the combination of a ball-governor with thetrain of gearing operated by the spring, whereby the movement of thegear-wheel is regulated.

In the drawings, A represents a sewingmachine stand or case, which is ofcabinet form, so as to inclose the motor. The driving mechanism is aspring-motor of ordinary construction, and does not require particulardescription here. In general terms, it may be said to consist of a woundspring, B, operating a train of gears, C, from which motion iscommunicated by a band, D, many other suitable device, to the mechanismfor reciprocating the needle.

The first third of the spring in length is about three-sixteenths of aninch in thickness, and the rest one-fourthinch thick, to receive uniformforce.

A shaft, E, usually carrying a balancewheel, F, is driven by the lastwheel in the train, and upon this horizontal shaft I mount abevel-pinion, G, and above the balancewheel shaft a vertical shaft, H,is mounted in suitable bearings A. The lower end of this shaft is abevel-pinion, I, which meshes with the pinion. The shaft H carries uponits upper end an ordinary ball-governor, consisting of the arms J,hinged to a fixed collar at the upper end of the shaft, and is providedwith heavy balls K at their lower ends, and connected by links L to asliding collar, M, on the shaft, the movement of the latter beinglimited by a stop, N, on the shaft.

Any other well-known construction of ballgovernor may be used.

When the mechanism is set in motion, and the spring is exerting itsgreatest force, the balls of the governor will be thrown outward in thewell-known way as the speed of the upright shaft H is increased. Theorbit of their revolution will therefore be increased, therebyincreasing the resistance to the rotation of the shaft, which istransferred to the train of gearing upon which the spring operates, andthus the motion is regulated by giving the spring more work to do as themovement of the gearing is increased, and vice versa.

The mechanism is also provided with afriction-brake, O, which actsdirectly upon the balance-wheel, and is operated by the attendant tocompletely stop the machine whenever desired, but is not necessary forregulating purposes.

I have applied my improvement to a fullsized sewing-machine, and foundit to operate successfully in seeming a regular and steady motion of theneedle.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

In a spring-motor for sewing-machines, the combination, with the springB secured to a drum, gearing C, shaft E, and balance-wheel F, of thegovernor-shaft H, bevel-pinions G and I, and driving-belt D,substantially as and for the purpose set forth.

GEORGE W. WILSON.

Witnesses:

L. A. BUNTING, W. C. CoRLrEs.

